(1) Characteristic Operators start heating of cleaning liquids. When concentration of cleaning liquids is not up to the concentration of cleaning, operator will add thick acid liquids or thick alkali liquids to acid tanks or alkali tanks. During cleaning, CIP liquids are fed trough pipes and valves by operators. Operators shall open the manual valve to feed the water into water tanks.Advantages: small investment on equipments and lower professional knowledge requirements on operators. After proper training, operator will be able to operate. For low investment, it is a good choice for small manufactures of milk products and juice.Disadvantage: Low automation, Control on temperature of cleaning liquid is not precise, it is not safe for adding the acid and soda manually by operators, low production efficiency. Characteristic Operators start heating of cleaning liquids. When concentration of cleaning liquids is not up to the concentration of cleaning, operator will add thick acid liquids or thick alkali liquids to acid tanks or alkali tanks. During cleaning, CIP liquids are fed trough pipes and valves by operators. Operators shall open the manual valve to feed the water into water tanks.(2) Advantages: small investment on equipments and lower professional knowledge requirements on operators. After proper training, operator will be able to operate. For low investment, it is a good choice for small manufactures of milk products and juice.Disadvantage: Low automation, Control on temperature of cleaning liquid is not precise, it is not safe for adding the acid and soda manually by operators, low production efficiency.